Willer Helga, Yussefi Menzler Minou, Sorensen Neil, & International Federation of Organic Agriculture Movements. The world of organic agriculture.
Čikaški stil citiranja (17. izdanje)Willer Helga, Yussefi Menzler Minou, Sorensen Neil, i International Federation of Organic Agriculture Movements. The World of Organic Agriculture.
MLA način citiranja (9. izdanje)Willer Helga, et al. The World of Organic Agriculture.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.